/*
 * This is the source code of Telegram for Android v. 1.3.x.
 * It is licensed under GNU GPL v. 2 or later.
 * You should have received a copy of the license in this archive (see LICENSE).
 *
 * Copyright Nikolai Kudashov, 2013-2017.
 */

package org.telegram.ui;

import android.content.Context;
import android.support.annotation.NonNull;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.FrameLayout;
import org.telegram.messenger.AndroidUtilities;
import org.telegram.messenger.FileLog;
import org.telegram.messenger.LocaleController;
import org.telegram.messenger.NotificationCenter;
import in.teleplus.R;
import org.telegram.messenger.Utilities;
import org.telegram.messenger.support.widget.LinearLayoutManager;
import org.telegram.messenger.support.widget.RecyclerView;
import org.telegram.ui.ActionBar.AlertDialog;
import org.telegram.ui.ActionBar.Theme;
import org.telegram.ui.ActionBar.ThemeDescription;
import org.telegram.ui.Cells.LanguageCell;
import org.telegram.ui.ActionBar.ActionBar;
import org.telegram.ui.ActionBar.ActionBarMenu;
import org.telegram.ui.ActionBar.ActionBarMenuItem;
import org.telegram.ui.ActionBar.BaseFragment;
import org.telegram.ui.Components.EmptyTextProgressView;
import org.telegram.ui.Components.LayoutHelper;
import org.telegram.ui.Components.RecyclerListView;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Timer;
import java.util.TimerTask;

public class LanguageSelectActivity extends BaseFragment implements NotificationCenter.NotificationCenterDelegate
{
    private ListAdapter listAdapter;
    private RecyclerListView listView;
    private ListAdapter searchListViewAdapter;
    private EmptyTextProgressView emptyView;

    private boolean searchWas;
    private boolean searching;

    private Timer searchTimer;
    private ArrayList<LocaleController.LocaleInfo> searchResult;
    private ArrayList<LocaleController.LocaleInfo> sortedLanguages;

    @Override
    public boolean onFragmentCreate()
    {
        fillLanguages();
        LocaleController.getInstance().loadRemoteLanguages(currentAccount);
        NotificationCenter.getGlobalInstance().addObserver(this, NotificationCenter.suggestedLangpack);
        return super.onFragmentCreate();
    }

    @Override
    public void onFragmentDestroy()
    {
        super.onFragmentDestroy();
        NotificationCenter.getGlobalInstance().removeObserver(this, NotificationCenter.suggestedLangpack);
    }

    @Override
    public View createView(Context context)
    {
        searching = false;
        searchWas = false;

        actionBar.setBackButtonImage(R.drawable.ic_ab_back);
        actionBar.setAllowOverlayTitle(true);
        actionBar.setTitle(LocaleController.getString("Language", R.string.Language));

        actionBar.setActionBarMenuOnItemClick(new ActionBar.ActionBarMenuOnItemClick()
        {
            @Override
            public void onItemClick(int id)
            {
                if (id == -1)
                {
                    finishFragment();
                }
            }
        });

        ActionBarMenu menu = actionBar.createMenu();
        ActionBarMenuItem item = menu.addItem(0, R.drawable.ic_ab_search).setIsSearchField(true).setActionBarMenuItemSearchListener(new ActionBarMenuItem.ActionBarMenuItemSearchListener()
        {
            @Override
            public void onSearchExpand()
            {
                searching = true;
            }

            @Override
            public void onSearchCollapse()
            {
                search(null);
                searching = false;
                searchWas = false;
                if (listView != null)
                {
                    emptyView.setVisibility(View.GONE);
                    listView.setAdapter(listAdapter);
                }
            }

            @Override
            public void onTextChanged(EditText editText)
            {
                String text = editText.getText().toString();
                search(text);
                if (text.length() != 0)
                {
                    searchWas = true;
                    if (listView != null)
                    {
                        listView.setAdapter(searchListViewAdapter);
                    }
                }
            }
        });
        item.getSearchField().setHint(LocaleController.getString("Search", R.string.Search));

        listAdapter = new ListAdapter(context, false);
        searchListViewAdapter = new ListAdapter(context, true);

        fragmentView = new FrameLayout(context);
        FrameLayout frameLayout = (FrameLayout) fragmentView;

        emptyView = new EmptyTextProgressView(context);
        emptyView.setText(LocaleController.getString("NoResult", R.string.NoResult));
        emptyView.showTextView();
        emptyView.setShowAtCenter(true);
        frameLayout.addView(emptyView, LayoutHelper.createFrame(LayoutHelper.MATCH_PARENT, LayoutHelper.MATCH_PARENT));

        listView = new RecyclerListView(context);
        listView.setEmptyView(emptyView);
        listView.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false));
        listView.setVerticalScrollBarEnabled(false);
        listView.setAdapter(listAdapter);
        frameLayout.addView(listView, LayoutHelper.createFrame(LayoutHelper.MATCH_PARENT, LayoutHelper.MATCH_PARENT));

        listView.setOnItemClickListener((view, position) ->
        {
            if (getParentActivity() == null || parentLayout == null)
                return;

            LocaleController.LocaleInfo localeInfo = null;
            if (searching && searchWas)
            {
                if (position >= 0 && position < searchResult.size())
                    localeInfo = searchResult.get(position);
            }
            else
            {
                if (position >= 0 && position < sortedLanguages.size())
                    localeInfo = sortedLanguages.get(position);
            }

            if (localeInfo != null)
            {
                LocaleController.getInstance().applyLanguage(localeInfo, true,
                        false, false, true, currentAccount);
                parentLayout.rebuildAllFragmentViews(false, false);
            }

            finishFragment();
        });

        listView.setOnItemLongClickListener((view, position) ->
        {
            LocaleController.LocaleInfo localeInfo = null;
            if (searching && searchWas)
            {
                if (position >= 0 && position < searchResult.size())
                    localeInfo = searchResult.get(position);
            }
            else
            {
                if (position >= 0 && position < sortedLanguages.size())
                    localeInfo = sortedLanguages.get(position);
            }

            if (localeInfo == null || localeInfo.pathToFile == null || getParentActivity() == null ||
                    localeInfo.isRemote() || localeInfo.isBuiltIn())
                return false;

            final LocaleController.LocaleInfo finalLocaleInfo = localeInfo;
            AlertDialog.Builder builder = new AlertDialog.Builder(getParentActivity());
            builder.setMessage(LocaleController.getString("DeleteLocalization", R.string.DeleteLocalization));
            builder.setTitle(LocaleController.getString("AppName", R.string.AppName));
            builder.setPositiveButton(LocaleController.getString("Delete", R.string.Delete), (dialogInterface, i) ->
            {
                if (LocaleController.getInstance().deleteLanguage(finalLocaleInfo, currentAccount))
                {
                    fillLanguages();
                    if (searchResult != null)
                    {
                        searchResult.remove(finalLocaleInfo);
                    }
                    if (listAdapter != null)
                    {
                        listAdapter.notifyDataSetChanged();
                    }
                    if (searchListViewAdapter != null)
                    {
                        searchListViewAdapter.notifyDataSetChanged();
                    }
                }
            });
            builder.setNegativeButton(LocaleController.getString("Cancel", R.string.Cancel), null);
            showDialog(builder.create());
            return true;
        });

        listView.setOnScrollListener(new RecyclerView.OnScrollListener()
        {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState)
            {
                if (newState == RecyclerView.SCROLL_STATE_DRAGGING && searching && searchWas)
                {
                    AndroidUtilities.hideKeyboard(getParentActivity().getCurrentFocus());
                }
            }
        });

        return fragmentView;
    }

    @Override
    public void didReceivedNotification(int id, int account, Object... args)
    {
        if (id == NotificationCenter.suggestedLangpack)
        {
            if (listAdapter != null)
            {
                fillLanguages();
                listAdapter.notifyDataSetChanged();
            }
        }
    }

    private void fillLanguages()
    {
        sortedLanguages = new ArrayList<>(LocaleController.getInstance().languages);
        final LocaleController.LocaleInfo currentLocale = LocaleController.getInstance().getCurrentLocaleInfo();
        Collections.sort(sortedLanguages, (o, o2) ->
        {
            if (o == currentLocale)
            {
                return -1;
            }
            else if (o2 == currentLocale)
            {
                return 1;
            }
            return o.name.compareTo(o2.name);
        });
    }

    @Override
    public void onResume()
    {
        super.onResume();
        if (listAdapter != null)
        {
            listAdapter.notifyDataSetChanged();
        }
    }

    public void search(final String query)
    {
        if (query == null)
        {
            searchResult = null;
        }
        else
        {
            try
            {
                if (searchTimer != null)
                {
                    searchTimer.cancel();
                }
            }
            catch (Exception e)
            {
                FileLog.e(e);
            }
            searchTimer = new Timer();
            searchTimer.schedule(new TimerTask()
            {
                @Override
                public void run()
                {
                    try
                    {
                        searchTimer.cancel();
                        searchTimer = null;
                    }
                    catch (Exception e)
                    {
                        FileLog.e(e);
                    }
                    processSearch(query);
                }
            }, 100, 300);
        }
    }

    private void processSearch(final String query)
    {
        Utilities.searchQueue.postRunnable(() ->
        {

            String q = query.trim().toLowerCase();
            if (q.length() == 0)
            {
                updateSearchResults(new ArrayList<>());
                return;
            }

            ArrayList<LocaleController.LocaleInfo> resultArray = new ArrayList<>();
            for (int a = 0; a < sortedLanguages.size(); a++)
            {
                LocaleController.LocaleInfo c = sortedLanguages.get(a);
                if (c.name.toLowerCase().startsWith(query) || c.nameEnglish.toLowerCase().startsWith(query))
                    resultArray.add(c);
            }

            updateSearchResults(resultArray);
        });
    }

    private void updateSearchResults(final ArrayList<LocaleController.LocaleInfo> arrCounties)
    {
        AndroidUtilities.runOnUIThread(() ->
        {
            searchResult = arrCounties;
            searchListViewAdapter.notifyDataSetChanged();
        });
    }

    private class ListAdapter extends RecyclerListView.SelectionAdapter
    {

        private Context mContext;
        private boolean search;

        public ListAdapter(Context context, boolean isSearch)
        {
            mContext = context;
            search = isSearch;
        }

        @Override
        public boolean isEnabled(RecyclerView.ViewHolder holder)
        {
            return true;
        }

        @Override
        public int getItemCount()
        {
            if (search)
            {
                if (searchResult == null)
                {
                    return 0;
                }
                return searchResult.size();
            }
            else
            {
                return sortedLanguages.size();
            }
        }

        @NonNull
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
        {
            return new RecyclerListView.Holder(new LanguageCell(mContext, false));
        }

        @Override
        public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position)
        {
            LanguageCell textSettingsCell = (LanguageCell) holder.itemView;
            LocaleController.LocaleInfo localeInfo;
            boolean last;
            if (search)
            {
                localeInfo = searchResult.get(position);
                last = position == searchResult.size() - 1;
            }
            else
            {
                localeInfo = sortedLanguages.get(position);
                last = position == sortedLanguages.size() - 1;
            }
            if (localeInfo.isLocal() && !localeInfo.isBuiltIn())
                textSettingsCell.setLanguage(localeInfo, String.format("%1$s (%2$s)", localeInfo.name, LocaleController.getString("LanguageCustom", R.string.LanguageCustom)), !last);
            else
                textSettingsCell.setLanguage(localeInfo, null, !last);

            textSettingsCell.setLanguageSelected(localeInfo == LocaleController.getInstance().getCurrentLocaleInfo());
        }

        @Override
        public int getItemViewType(int i)
        {
            return 0;
        }
    }

    @Override
    public ThemeDescription[] getThemeDescriptions()
    {
        return new ThemeDescription[]{
                new ThemeDescription(fragmentView, ThemeDescription.FLAG_BACKGROUND, null, null, null, null, Theme.key_windowBackgroundWhite),

                new ThemeDescription(actionBar, ThemeDescription.FLAG_BACKGROUND, null, null, null, null, Theme.key_actionBarDefault),
                new ThemeDescription(listView, ThemeDescription.FLAG_LISTGLOWCOLOR, null, null, null, null, Theme.key_actionBarDefault),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_ITEMSCOLOR, null, null, null, null, Theme.key_actionBarDefaultIcon),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_TITLECOLOR, null, null, null, null, Theme.key_actionBarDefaultTitle),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_SELECTORCOLOR, null, null, null, null, Theme.key_actionBarDefaultSelector),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_SEARCH, null, null, null, null, Theme.key_actionBarDefaultSearch),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_SEARCHPLACEHOLDER, null, null, null, null, Theme.key_actionBarDefaultSearchPlaceholder),

                new ThemeDescription(listView, ThemeDescription.FLAG_SELECTOR, null, null, null, null, Theme.key_listSelector),

                new ThemeDescription(emptyView, ThemeDescription.FLAG_TEXTCOLOR, null, null, null, null, Theme.key_emptyListPlaceholder),

                new ThemeDescription(listView, 0, new Class[]{View.class}, Theme.dividerPaint, null, null, Theme.key_divider),

                new ThemeDescription(listView, 0, new Class[]{LanguageCell.class}, new String[]{"textView"}, null, null, null, Theme.key_windowBackgroundWhiteBlackText),
                new ThemeDescription(listView, 0, new Class[]{LanguageCell.class}, new String[]{"textView2"}, null, null, null, Theme.key_windowBackgroundWhiteGrayText3),
                new ThemeDescription(listView, 0, new Class[]{LanguageCell.class}, new String[]{"checkImage"}, null, null, null, Theme.key_featuredStickers_addedIcon),
        };
    }
}
